linux-kernel - Re: sk_lock: inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20090709.171355.09466097.davem@davemloft.net>
Date:	Thu, 09 Jul 2009 17:13:55 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	fengguang.wu@...el.com
Cc:	herbert@...dor.apana.org.au, linux-kernel@...r.kernel.org,
	linux-nfs@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: sk_lock: inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-W}
 usage

From: Wu Fengguang <fengguang.wu@...el.com>
Date: Thu, 9 Jul 2009 21:17:46 +0800

> @@ -2100,7 +2100,8 @@ void tcp_send_fin(struct sock *sk)
>  	} else {
>  		/* Socket is locked, keep trying until memory is available. */
>  		for (;;) {
> -			skb = alloc_skb_fclone(MAX_TCP_HEADER, GFP_KERNEL);
> +			skb = alloc_skb_fclone(MAX_TCP_HEADER,
> +					       sk->sk_allocation);
>  			if (skb)
>  				break;
>  			yield();

I think this specific case needs more thinking.

If the allocation fails, and it's GFP_ATOMIC, we are going to yield()
(which sleeps) and loop endlessly waiting for the allocation to
succeed.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/